/Engine/Source/Developer/PakFileUtilities/Public/PakFileUtilities.h
Write the index and other data at the end of a pak file after all the entries
void WritePakFooter ( [FArchive](API\Runtime\Core\Serialization\FArchive) & PakHandle, [FPakFooterInfo](API\Developer\PakFileUtilities\FPakFooterInfo) & FooterInfo )